View source for Potamogeton gramineus

{{Treatment/ID
|accepted_name=Potamogeton gramineus
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=1: 127. 1753 (as gramineum)
}}
|common_names=Potamot à feuilles de graminées
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Potamogeton gramineus var. maximus
|authority=Morong
}} {{Treatment/ID/Synonym
|name=Potamogeton gramineus var. myriophyllus
|authority=J. W. Robbins
}}
|hierarchy=Potamogetonaceae;Potamogeton;Potamogeton gramineus
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Potamogetonaceae]]</div><div class="higher-taxon"><small>genus</small>[[Potamogeton]]</div><div class="higher-taxon"><small>species</small>[[Potamogeton gramineus]]</div></div>
|volume=Volume 22
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Rhizomes </b>present. <b>Cauline</b> stems terete to flattened, without spots, to 150 cm; nodal glands absent. <b>Turions</b> absent. <b>Leaves</b> both submersed and floating or submersed only, &#177; spirally arranged. <b>Submersed</b> leaves sessile or rarely petiolate, lax; stipules persistent, inconspicuous, convolute, free from blade, pale green to brown, not ligulate, 1.3–1.6 cm, not fibrous, not shredding at tip, apex acute to obtuse; petioles to 3 cm; blade light green to brownish green, elliptic, not arcuate, 3.1–9.1 cm × 3–27 mm, base attenuate, without basal lobes, not clasping, margins entire, rarely crispate, apex not hoodlike, acuminate, lacunae in 1–2 rows each side of midvein; veins 3–9. <b>Floating</b> leaves: petioles continuous in color to apex, 3–4.5 cm; blade yellow-green to dark green, elliptic to ovate, 3.5–4 cm × 16–20 mm, base rounded, apex acuminate; veins 11–13. <b>Inflorescences</b> emersed, unbranched; peduncles not dimorphic, both axillary and terminal, erect to ascending, cylindric, 3.2–7.7 cm; spikes not dimorphic, cylindric, 15–35 mm. <b>Fruits</b> sessile, greenish brown, ovoid, laterally compressed, abaxially and laterally keeled, 1.9–2.3 × 1.8–2 mm, lateral keels without points; beak erect, 0.3–0.5 mm; sides without basal tubercles; embryo with less than 1 full spiral. <b>2n</b> = 52.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer–fall.
|habitat=Ponds, lakes, streams, and rivers
|elevation=0–3500 m
|distribution=Greenland;St. Pierre and Miquelon;Alta.;B.C.;Man.;N.B.;Nfld. and Labr.;N.W.T.;N.S.;Nunavut;Ont.;P.E.I.;Que.;Sask.;Yukon;Alaska;Ariz.;Calif.;Colo.;Conn.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;Maine;Md.;Mass.;Mich.;Minn.;Mont.;Nebr.;Nev.;N.H.;N.J.;N.Y.;N.Dak.;Ohio;Oreg.;Pa.;R.I.;S.Dak.;Utah;Vt.;Wash.;Wis.;Wyo.;Eurasia.
|discussion=<p>Seven hybrids, <i>Potamogeton gramineus</i> × <i>P. nodosus</i> (= P. × argutulus Hagstr&ouml;m), <i>P. gramineus</i> × <i>P. richardsonii</i> (= P. hagstroemii A. Bennett [as hagstromii]), <i>P. alpinus</i> × <i>P. gramineus</i> (= P. × nericius Hagstr&ouml;m), <i>P. gramineus</i> × <i>P. perfoliatus</i> (= P. × nitens Weber [P. × subnitens Hagstr&ouml;m]), <i>P. gramineus</i> × <i>P. natans</i> (= P. × sparganiifolius Laestadius ex Fries), <i>P. gramineus</i> × <i>P. illinoensis</i> [= P. × spathuliformis (J. W. Robbins) Morong)], and <i>P. gramineus</i> × <i>P. praelongus</i> (= P. × vilnensis Galinis), have been described.</p><!--
--><p>Three varieties were recognized (E. C. Ogden 19435) and treated (M. L. Fernald 1950). These varieties, <i>Potamogeton gramineus</i> <i></i></i>var.<i><i> gramineus</i>, deletion}<i>P. gramineus</i> var. myriophyllus, and <i>P. gramineus</i> var. maximus, were said to be separated by the shape and size of the submersed leaves. We have studied many populations of this species in the field and have observed on several occasions that a single population has leaf morphology variable enough to include all three varieties. We have, , therefore, chosen not to recognize any infraspecific categories for this species.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Potamogeton gramineus
|author=
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=Potamogeton gramineus var. maximus;Potamogeton gramineus var. myriophyllus
|basionyms=
|family=Potamogetonaceae
|phenology=Flowering summer–fall.
|habitat=Ponds, lakes, streams, and rivers
|elevation=0–3500 m
|distribution=Greenland;St. Pierre and Miquelon;Alta.;B.C.;Man.;N.B.;Nfld. and Labr.;N.W.T.;N.S.;Nunavut;Ont.;P.E.I.;Que.;Sask.;Yukon;Alaska;Ariz.;Calif.;Colo.;Conn.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;Maine;Md.;Mass.;Mich.;Minn.;Mont.;Nebr.;Nev.;N.H.;N.J.;N.Y.;N.Dak.;Ohio;Oreg.;Pa.;R.I.;S.Dak.;Utah;Vt.;Wash.;Wis.;Wyo.;Eurasia.
|reference=None
|publication title=Sp. Pl.
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V22/V22_252.xml
|genus=Potamogeton
|species=Potamogeton gramineus
}}<!--

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